Method for preparing block polyether amide foam particles with sandbag structure
a polyether amide and foaming particle technology, applied in the field of foaming materials, can solve the problems of inability to recycle prepared products, inability to guarantee the uniformity of foaming, waste of resources,
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example 1
[0055]20 kg TPU, 50 kg talcum powder and 0.15 kg KH 550 silane coupling agent were premixed in a disperser, and then melted and blended by a twin screw granulator to prepare 60 kg core-shell structure blended particles.
[0056]The blended particles I 60 kg prepared above were premixed with 1000 kg of block polyether amide, melt blended by an extruder, and cut under water to obtain block polyether amide spindle-shaped blended particles II 1030 kg with a single particle weight of 18 mg and a length-diameter ratio of 2 and a sandbag structure.
[0057]Weighing 500 kg of blended particles II into an autoclave, charging 250 kg of carbon dioxide and 50 kg of argon at a constant temperature of 35° C. at a pressure of 24 MPa, holding the autoclave at a constant temperature for 0.5 hours, evacuating the entire pressure in the autoclave with a pressure relief valve for a specified time of 20 seconds when permeation reaches equilibrium, and taking out the blended particles III 500 kg with a foaming...
example 2
[0059]150 kg of EPDM, 10 kg of calcium carbonate and 0.2 kg of LK-132 titanate coupling agent were premixed in a disperser, and then melt blended by a twin screw granulator to prepare core-shell structure blended particles I 154 kg.
[0060]Then, the blended particles I 154 kg prepared above were premixed with 1000 kg of block polyether amide, melted and blended by an extruder, and cut under water to obtain block polyether amide spherical blended particles II 1150 kg with a single particle weight of 4 mg and a ratio of length to diameter of 1 and a sandbag structure.
[0061]Weighing 500 kg of blended particles II into an autoclave, charging 250 kg of carbon dioxide and 50 kg of nitrogen at a constant temperature of 60° C. at a pressure of 24 MPa, holding the autoclave at a constant temperature for 8 hours, and emptying the autoclave with a pressure relief valve for a specified time of 60 seconds to take out the blended particles III 500 kg with a foaming agent content of 20%.
[0062]The ab...
example 3
[0063]100 kg of LDPE, 20 kg of silica and 0.2 kg of KH 570 silane coupling agent were premixed in a dispersion machine and then melt blended by a twin screw granulator to prepare core-shell structure blended particles I 118 kg.
[0064]Then, the blended particles I 118 kg prepared above were premixed with 1000 kg of block polyether amide, melted and blended by an extruder, and cut under water to obtain block polyether amide fusiform blended particles II 1110 kg with a single particle weight of 50 mg and a length-to-diameter ratio of 5 and a sandbag structure.
[0065]Weigh 500 kg of blended particles II and put them into an autoclave. The autoclave temperature is constant at 50° C., 50K g of carbon dioxide is introduced at a pressure of 4 MPa, and the autoclave is kept at a constant temperature for 0.5 hours. When the permeation reaches equilibrium, use a pressure relief valve to empty the autoclave for a specified time of 30 seconds, and take out the blended particles III 500 kg with a f...
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